Well then Class Maker is going to help you.
You just need to complete the fields and press a button. The classes will be automatically generated for you in /sdcard/ClassMaker.
This app is open source and add free. The source code is available here: https://github.com/SmartDEVTeam/ClassMaker
This is an unofficial application for Minecraft Pocket Edition. This application is not affiliated in any way with Mojang AB. The Minecraft Name, the Minecraft Brand and the Minecraft Assets are all property of Mojang AB or their respectful owner. All rights reserved. In accordance with http://account.mojang.com/documents/brand_guidelines